kotlin-stdlib/kotlin.text/ifBlank

ifBlank

inline fun <C : CharSequence, R, R> C.ifBlank(defaultValue: () -> R): R(source)

Returns this char sequence if it is not empty and doesn't consist solely of whitespace characters, or the result of calling defaultValue function otherwise.

Since Kotlin

1.3

Samples

import kotlin.test.*

fun main() { 
   //sampleStart 
   val blank = "    "

val blankOrNull: String? = blank.ifBlank { null }
println(blankOrNull) // null

val blankOrDefault = blank.ifBlank { "default" }
println(blankOrDefault) // default

val nonBlank = "abc"
val sameString = nonBlank.ifBlank { "def" }
println("nonBlank === sameString is ${nonBlank === sameString}") // true 
   //sampleEnd
}